Investigation of the adsorption properties of U(VI) by sulfonic acid-functionalized carbon materials

In this study, sulfonic acid-functionalized carbon materials (CS-SO 3 H) was carbonized and functionalized by polyphosphazene (PZS). The morphology and structure were characterized by FTIR, XPS and SEM. The influences of pH, contact time, initial concentration and temperature of CS-SO 3 H for uranyl ions were investigated. Results indicated that the adsorption equilibrium time was about 20 min. The adsorption process was more consistent with the Langmuir isotherm and the pseudo-second-order model. In addition, the maximum adsorption capacity of CS-SO 3 H was about 341.98 mg/g. Moreover, the thermodynamic parameters of ΔG, ΔH and ΔS show that the uranium adsorption process was spontaneous and endothermic.